817421317 has 2 divisors, whose sum is σ = 817421318. Its totient is φ = 817421316.

The previous prime is 817421291. The next prime is 817421327. The reversal of 817421317 is 713124718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 587868516 + 229552801 = 24246^2 + 15151^2 .

It is a cyclic number.

It is not a de Polignac number, because 817421317 - 2²⁷ = 683203589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (817421327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408710658 + 408710659.

It is an arithmetic number, because the mean of its divisors is an integer number (408710659).

Almost surely, 2^817421317 is an apocalyptic number.

It is an amenable number.

817421317 is a deficient number, since it is larger than the sum of its proper divisors (1).

817421317 is an equidigital number, since it uses as much as digits as its factorization.

817421317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 34.

The square root of 817421317 is about 28590.5809140003. The cubic root of 817421317 is about 935.0079849090.

The spelling of 817421317 in words is "eight hundred seventeen million, four hundred twenty-one thousand, three hundred seventeen".